Drupal Theming - Bootstrap Import errors - import not found or unreadable: bootstrap.

here was the error

error sass/bootstrap/test/dummy_sass_only/import_all.sass (Line 1: File to import not found or unreadable: bootstrap.

Load paths:

  */sites/all/themes/*/sass

  /Library/Ruby/Gems/2.0.0/gems/compass-0.12.2/frameworks/blueprint/stylesheets

  /Library/Ruby/Gems/2.0.0/gems/compass-0.12.2/frameworks/compass/stylesheets   Compass::SpriteImporter)

The fix was to change this line in /sites/all/themes/my_theme/sass/custom.scss

@import 'bootstrap/assets/stylesheets/*';

to 

@import 'bootstrap/assets/stylesheets/bootstrap’;